Penuaan (Inggris:Aging) adalah hasil akumulasi dari perubahan organisme atau objek karena waktu. Penuaan pada manusia berkaitan dengan proses multidimensional fisik, psikologis dan perubahan sosial. Umur merupakan ukuran secara kronologis, dan ulang tahun seseorang merupakan hal yang penting dalam masalah "penuaan".


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